Fractured rock mass true triaxial pulse grouting test control system and test method thereof

Abstract

The invention discloses a fractured rock mass true triaxial pulse grouting test control system and test method considering a slurry-rock coupling effect, and belongs to the technical field of fractured rock mass grouting reinforcement, a true triaxial grouting test platform comprises a first mounting body, a second mounting body, a third mounting body, a fourth mounting body, a plurality of stress loaders and a plurality of loading pressure heads, the plurality of stress loaders are in one-to-one correspondence with the plurality of loading pressure heads; the pulse grouting pump is connected between the slurry storage tank and the slurry conveying pipe, and the slurry conveying pipe is suitable for being communicated with the fractured rock mass. Therefore, by coupling the true triaxial grouting test platform and the pulse grouting system, the complex stress environment of the fractured rock mass of the underground engineering can be accurately reproduced, the pulse pressure grout with a certain frequency is provided for the fractured rock mass, the grout diffusion range is remarkably enlarged, the rock mass grouting efficiency is improved, and the grouting efficiency of the fractured rock mass is improved. And the coupling effect of grouting pressure and fracture deformation can be synchronized, the grouting reinforcement effect of the fractured rock mass is improved, and the reliability and accuracy of experimental data can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fissure rock mass grouting reinforcement, in particular to a fissure rock mass true triaxial pulse grouting test control system considering slurry-rock coupling effect and a test method thereof. BACKGROUND

[0002] In underground engineering construction, such as tunnel, subway, hydropower station and mine exploitation, etc., unfavorable geological bodies such as water-rich rock stratum and high-stress fissure rock mass are often encountered, which can easily cause water inrush, collapse and other surrounding rock instability disasters, seriously affecting construction safety and engineering stability.

[0003] Grouting technology is often used as a key means for surrounding rock disaster control. Through the penetration, filling and consolidation of slurry, not only can the soft surrounding rock be effectively reinforced, but also the seepage channel can be blocked to prevent water inrush disasters, and the rock mass strength and engineering stability can be significantly improved. Due to the different self-weight and tectonic stress of rock mass, the stress environment of rock mass is often in a three-directional unequal pressure state. Therefore, the true triaxial grouting simulation system can restore the true triaxial stress environment of rock mass, and the grouting technology can improve the reinforcement effect of fissure rock mass. However, the existing grouting test system is limited by the conventional triaxial loading mode and constant pressure grouting process, and faces problems such as low grouting efficiency, difficulty in accurately reproducing the complex stress environment of underground, insufficient monitoring means for slurry-rock dynamic coupling effect, etc., which leads to limited applicability of the grouting test system, reduced data reliability, and deviation of reinforcement effect from actual engineering. Therefore, it is of great theoretical research significance and engineering application value to develop a fissure rock mass true triaxial pulse grouting test control system considering slurry-rock coupling effect, realize independent regulation of true triaxial ground stress, stimulate directional expansion of rock mass fissure, increase the diffusion range of slurry, and improve the authenticity of reinforced mechanical parameters by synchronizing the coupling effect of grouting pressure and fissure deformation. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to propose a fissure rock mass true triaxial pulse grouting test control system considering slurry-rock coupling effect and a test method thereof. The fissure rock mass true triaxial pulse grouting test control system has high grouting efficiency, accurate stress environment simulation and high test data reliability, which is beneficial to improve the grouting reinforcement effect.

[0005] The present application proposes a true triaxial pulse grouting test control system considering slurry-rock coupling effect and a test method thereof, which is based on the method of mechanical loading. By constructing a true triaxial independent servo loading system, the present application realizes 、 The asymmetric dynamic regulation of three-way stress accurately reproduces the complex stress environment of the fractured rock mass of underground engineering; the constant pressure and periodic oscillation pressure of the pulse grouting pump are combined to form a pulse grouting pressure with a certain frequency, so as to stimulate the directional expansion of the rock mass fracture and significantly increase the diffusion range of the slurry and improve the rock mass injection efficiency; based on the orthogonal three-way array layout, high-precision displacement extensometers are arranged in the X / Y / Z axis directions, the normal opening amount, tangential slip amount and spatial torsional deformation of the rock mass fracture are captured during the grouting process, and the coupling effect of synchronous grouting pressure and fracture deformation; the in-situ loading test of the rock mass after grouting is carried out by using a true triaxial independent servo loading system, so that the sample is not disturbed or less disturbed, and the authenticity of the reinforced mechanical parameters is improved.

[0006] The control system of the true triaxial pulse grouting test of the fractured rock mass considering the slurry-rock coupling effect according to the application comprises: a true triaxial grouting test platform, which comprises: a first mounting body, a second mounting body, a third mounting body, a fourth mounting body, a plurality of stress loaders and a plurality of loading pressure heads, wherein the plurality of stress loaders correspond to the plurality of loading pressure heads one by one; Along the first direction, the two ends of the first mounting body are correspondingly provided with the stress loaders, along the second direction, the two ends of the first mounting body are correspondingly provided with the stress loaders, the second mounting body is arranged in the first mounting body and defines a test cavity, the third mounting body and the fourth mounting body are arranged at the two ends of the second mounting body along the third direction, the third mounting body defines a first receiving cavity, and the fourth mounting body defines a second receiving cavity, and the stress loaders are arranged in the first receiving cavity and the second receiving cavity; Along the first direction, the two ends of the second mounting body are provided with the loading pressure heads, along the second direction, the upper end of the second mounting body is provided with the loading pressure head, and the lower end of the second mounting body is provided with the loading pressure head on the inner side, along the third direction, the two ends of the second mounting body are provided with the loading pressure heads, a plurality of the loading pressure heads are located at one end of the test cavity and jointly define a sample space suitable for placing the fractured rock mass, the stress loaders are used for directly or indirectly applying stress to the corresponding loading pressure heads in the direction towards the sample space, and any two directions of the first direction, the second direction and the third direction are perpendicular to each other; A water pressure loading system, comprising: a water storage tank, a constant-speed constant-pressure pump and a water inlet pipe, the constant-speed constant-pressure pump is connected between the water storage tank and the water inlet pipe, and the water inlet pipe is adapted to communicate with the fractured rock mass; A pulse grouting system, comprising: a slurry storage tank, a pulse grouting pump and a slurry conveying pipe, the pulse grouting pump is connected between the slurry storage tank and the slurry conveying pipe, and the slurry conveying pipe is adapted to communicate with the fractured rock mass; The data measurement and control system comprises a plurality of displacement extensometers and a data acquisition control device, the plurality of displacement extensometers are arranged on a plurality of loading heads, the plurality of displacement extensometers comprise a first direction displacement extensometer, a second direction displacement extensometer and a third direction displacement extensometer, the data acquisition control device is signal connected with the plurality of displacement extensometers, and the data acquisition control device is configured to control loading stress of the plurality of stress loaders.

[0007] In some examples of the present application, the first mounting body comprises a first mounting plate, a second mounting plate, a plurality of columns, a third mounting plate and a fourth mounting plate, the first mounting plate and the second mounting plate are arranged at intervals along the second direction, the plurality of columns are arranged through the first mounting plate and the second mounting plate to connect the first mounting plate and the second mounting plate, the third mounting plate and the fourth mounting plate are arranged at intervals along the first direction and are arranged on the columns, and the stress loaders are arranged on the first mounting plate, the second mounting plate, the third mounting plate and the fourth mounting plate.

[0008] In some examples of the present application, the true triaxial grouting test platform further comprises a plurality of rollers, the lower ends of the second mounting body, the third mounting body and the fourth mounting body are provided with the rollers, and the first mounting body further comprises a guide rail, the second mounting plate is formed with a guide rail groove, the guide rail is arranged in the guide rail groove, and the rollers are in rolling connection with the guide rail.

[0009] In some examples of the present application, the true triaxial grouting test platform further comprises a plurality of loading plates, and the loading heads corresponding to the stress loaders at one end of the test cavity are provided with the loading plates.

[0010] In some examples of the present application, the true triaxial grouting test platform further comprises a rubber sleeve and a fixing ring, the rubber sleeve can be sleeved on the fissured rock mass and outside the loading plates on the loading heads at the two ends of the second mounting body along the third direction, and the fixing ring is sleeved outside the rubber sleeve to fix the rubber sleeve.

[0011] In some examples of the present application, the pulse grouting system further comprises a grouting pipe, the grouting pipe is connected with the grouting pipe and extends into the first containing cavity, The grouting pipe is arranged through the loading heads and the loading plates corresponding to the stress loaders of the first containing cavity and extends into the fissured rock mass.

[0012] In some examples of the present application, the pulse grouting system further comprises a water outlet pipe and a water gushing collection tank, the water outlet pipe is connected between the first containing cavity and the water gushing collection tank. And / or, the pulse grouting system further comprises a backflow valve arranged in the slurry conveying pipe.

[0013] In some examples of the present application, the pulse grouting system further comprises a camera arranged in the first receiving cavity and in communication connection with the data acquisition control device, the camera being configured to acquire water inrush conditions during grouting.

[0014] In some examples of the present application, the water inlet pipe is arranged in the loading pressure head corresponding to the stress loader arranged in the second receiving cavity and is adapted to communicate with the fractured rock mass. Or, the loading pressure head corresponding to the stress loader arranged in the second receiving cavity is formed with a water inlet channel, the water inlet pipe communicates with the water inlet channel, and the water inlet channel is adapted to communicate with the fractured rock mass.

[0015] In some examples of the present application, the data measurement and control system comprises a hydraulic pump station, the data acquisition control device is in communication connection with the hydraulic pump station, the hydraulic pump station is connected with a plurality of stress loaders, and the data acquisition control device is configured to control the hydraulic pump station to control the loading stress of the plurality of stress loaders.

[0016] In some examples of the present application, the loading pressure head corresponding to the stress loader arranged in the second receiving cavity comprises a pressure head body and a piston rod, the pressure head body is located in the test cavity, and the piston rod is arranged in the second mounting body and connected with the pressure head body.

[0017] A test method of a true triaxial pulse grouting test control system considering the coupling effect of grout-rock, characterized in that, comprising: Preparation of the fractured rock mass; Assembling the fractured rock mass assembly, comprising: coaxially positioning and assembling two loading pressure heads, two loading pressure plates and the fractured rock mass along the third direction, externally sleeving a rubber sleeve and tightening, sealing the rubber sleeve, and placing the assembled fractured rock mass assembly in the test cavity; Assembling the test cavity, comprising: installing displacement extensometers on the side edges of a plurality of the loading pressure heads, connecting the water inlet pipe with the fractured rock mass, arranging the piston rod in the rear side wall of the second mounting body and connecting with the loading pressure head in the test cavity, connecting the grouting pipe with the fractured rock mass, and connecting the slurry conveying pipe with the grouting pipe; Assembling the third mounting body and the fourth mounting body, comprising: connecting the third mounting body with the front side wall of the second mounting body, connecting the fourth mounting body with the rear side wall of the second mounting body, and connecting the water outlet pipe with the first receiving cavity of the third mounting body; The true triaxial stress loading comprises: loading a stress loader under a second bottom wall of the second mounting body through a data measurement and control system, making the second mounting body, the third mounting body and the fourth mounting body as a whole rise, stopping loading after the roller leaves the guide rail, and then loading stress in the first direction and the second direction through the data measurement and control system, and loading stress in the third direction after the stress reaches an initial value and is stable; The pulse grouting test is performed, comprising: after the three-way stress reaches an initial value and is stable, setting water injection pressure parameters through a water pressure loading system, opening a constant-speed constant-pressure pump and a liquid pressure regulating valve to perform water injection, controlling a camera to perform image information acquisition through the data measurement and control system, setting pulse grouting parameters through a pulse grouting system when the loading pressure head of the first containing cavity appears sudden water inrush, and opening a pulse grouting pump to start pulse grouting when no obvious water inrush phenomenon appears or the grouting parameters meet the grouting requirements.

[0018] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 is a schematic view of a true triaxial pulse grouting test control system for fractured rock mass considering grout-rock coupling according to an embodiment of the present application; Figure 2 is a sectional view (along the third direction) of part of the structure of the true triaxial grouting test platform according to an embodiment of the present application; Figure 3 is a sectional view (along the first direction) of part of the structure of the true triaxial grouting test platform according to an embodiment of the present application; Figure 4 is a structural schematic view of a first mounting plate, a second mounting plate and a guide rail according to an embodiment of the present application; Figure 5 is an exploded view of a fractured rock mass, a rubber sleeve and a loading pressure head according to an embodiment of the present application; Figure 6 is a structural schematic view of a water pressure loading system according to an embodiment of the present application; Figure 7 is a structural schematic view of a pulse grouting system according to an embodiment of the present application; Figure 8 is a structural schematic view of a data measurement and control system according to an embodiment of the present application.

[0020] Reference signs: The crack rock mass true triaxial pulse grouting test control system 100 considering the grout-rock coupling effect; the crack rock mass 99; The true triaxial grouting test platform 1; The first mounting body 101; the first mounting plate 1015; the second mounting plate 1016; the third mounting plate 1017; the fourth mounting plate 1018; the fifth mounting plate 1019; the cover plate 1020; the stand column 1021; the mounting groove 1022; the first matching hole 1023; the accommodation groove 1024; The second mounting body 12; the second top wall 121; the second bottom wall 122; the second left side wall 123; the second right side wall 124; the front side wall 125; the rear side wall 126; the test cavity 127; the test sample space 128; The third mounting body 13; the first accommodation cavity 131; the first side wall 132; The fourth mounting body 14; the second accommodation cavity 141; the second side wall 142; The stress loader 15; the loading pressure head 16; the loading pressure plate 17; The water pressure loading system 2; the water storage tank 21; the constant speed and constant pressure pump 22; the water inlet pipe 23; the throttle valve 24; the liquid pressure regulating valve 25; the first electromagnetic flowmeter 26; The pulse grouting system 3; the grout storage tank 31; the pulse grouting pump 32; the grout conveying pipe 33; the pressure transmitter 34; the second electromagnetic flowmeter 35; the grouting pipe 36; the water outlet pipe 37; the water gushing collection tank 38; the backflow valve 39; the camera device 40; The data measurement and control system 4; the displacement extensometer 41; the first direction displacement extensometer 411; the second direction displacement extensometer 412; the third direction displacement extensometer 413; the hydraulic pump station 414; the data acquisition control equipment 415; The pressure head body 51; the piston rod 52; the roller 53; the roller support 54; the guide rail groove 55; the guide rail 56; the rubber sleeve 57; the fixing ring 58; the guide rail foot 59; the baffle 60. DETAILED DESCRIPTION

[0021] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0022] Reference is made below to Figures 1-8 The crack rock mass true triaxial pulse grouting test control system 100 considering the grout-rock coupling effect according to the embodiments of the present application is described.

[0023] As Figures 1-8As shown, the true triaxial pulse grouting test control system 100 for fractured rock mass considering magma-rock coupling according to an embodiment of the present invention includes: a true triaxial grouting test platform 1, a hydraulic loading system 2, a pulse grouting system 3, and a data measurement and control system 4.

[0024] The true triaxial grouting test platform 1 includes: a first mounting body 101, a second mounting body 12, a third mounting body 13, a fourth mounting body 14, multiple stress loaders 15, and multiple loading heads 16, with each stress loader 15 corresponding to one of the multiple loading heads 16. Along the first direction (i.e.) Figure 3 (as shown in the X direction), stress loaders 15 are provided at both ends of the first mounting body 101, along the second direction (i.e. Figure 2 (As shown in the Z direction), stress loaders 15 are provided at both ends of the first mounting body 101, the second mounting body 12 is located inside the first mounting body 101 and defines the test chamber 127, and the third mounting body 13 and the fourth mounting body 14 are along the third direction (i.e., Figure 2 The third mounting body 13 defines the first receiving cavity 131, and the fourth mounting body 14 defines the second receiving cavity 141. Stress loaders 15 are provided in both the first receiving cavity 131 and the second receiving cavity 141. Along the first direction (i.e.) Figure 3 As shown in the X direction), both ends of the second mounting body 12 are provided with loading heads 16, along the second direction (i.e., Figure 2 (As shown in the Z direction), a loading head 16 is inserted through the upper end of the second mounting body 12, and a loading head 16 is fixedly installed on the inner side of the lower end of the second mounting body 12, along the third direction (i.e. Figure 2 (As shown in the Y direction), both ends of the second mounting body 12 are equipped with loading heads 16. Multiple loading heads 16 are located in the test chamber 127, which together confine the fractured rock mass 99 within the sample space 128. The stress loader 15 is used to directly or indirectly apply stress to the corresponding loading head 16 in the direction toward the sample space 128. The first direction (i.e., Figure 3 The X direction shown), the second direction (i.e. Figure 2 The Z direction shown), and the third direction (i.e. Figure 1 Any two directions in the Y-direction shown are perpendicular to each other; The water pressure loading system 2 includes: a water storage tank 21, a constant speed and constant pressure pump 22, and a water inlet pipe 23. The constant speed and constant pressure pump 22 is connected between the water storage tank 21 and the water inlet pipe 23, and the water inlet pipe 23 is connected to the fractured rock mass 99. The pulse grouting system 3 includes: a grout storage tank 31, a pulse grouting pump 32, and a grout delivery pipe 33. The pulse grouting pump 32 is connected between the grout storage tank 31 and the grout delivery pipe 33, and the grout delivery pipe 33 is adapted to communicate with the fractured rock mass 99. The data measurement and control system 4 includes: multiple displacement extensometers 41 and a data acquisition and control device 415. The multiple displacement extensometers 41 are respectively installed on multiple loading heads 16. The multiple displacement extensometers 41 include: a first-direction displacement extensometer 411, a second-direction displacement extensometer 412, and a third-direction displacement extensometer 413. The data acquisition and control device 415 is connected to the multiple displacement extensometers 41 to acquire displacement signals in real time during the test. At the same time, the data acquisition and control device 415 is used to control the loading stress of multiple stress loaders 15.

[0025] The number of stress loaders 15 can be multiple, including but not limited to two, three, four, etc. The number of loading heads 16 can also be multiple, including but not limited to two, three, four, etc. Multiple stress loaders 15 and multiple loading heads 16 are arranged in a one-to-one correspondence. As some embodiments of this application, the number of stress loaders 15 is six, and the number of loading heads 16 is the same as the number of stress loaders 15 and they are arranged in a one-to-one correspondence.

[0026] The stress loader 15 can be configured as, but is not limited to, a hydraulic stress loader, an electric stress loader, etc. As some embodiments of this application, the stress loader 15 is configured as a hydraulic servo loader to control the stress loader 15 hydraulically. The loading head 16 can be configured as, but is not limited to, a planar loading head, a spherical loading head, etc. As some embodiments of this application, the loading head 16 is configured as a planar loading head.

[0027] Along the first direction (i.e.) Figure 3 As shown in the X direction), stress loaders 15 are provided at both ends of the first mounting body 101. As some embodiments of this application, such as Figure 3 As shown, along the first direction (i.e. Figure 3 (in the X direction shown) The first mounting body 101 has a third mounting plate 1017 and a fourth mounting plate 1018 opposite each other, and two stress loaders 15 are respectively disposed on the third mounting plate 1017 and the fourth mounting plate 1018 opposite each other.

[0028] Along the second direction (i.e.) Figure 2 As shown in the Z direction), stress loaders 15 are provided at both ends of the first mounting body 101. As some embodiments of this application, such as Figure 2 As shown, along the second direction (i.e. Figure 2 (shown in the Z direction), the first mounting body 101 has a first mounting plate 1015 and a second mounting plate 1016 opposite to each other, and two stress loaders 15 are respectively disposed on the first mounting plate 1015 and the second mounting plate 1016 opposite to each other.

[0029] The second mounting body 12 is arranged in the first mounting body 101, and the second mounting body 12 can define a test cavity 127.

[0030] In the third direction (i.e., the Y direction as shown), Figure 2 The second mounting body 12 is arranged in the first mounting body 101, and the second mounting body 12 can define a test cavity 127.

[0031] The third mounting body 13 defines a first receiving cavity 131, and the fourth mounting body 14 defines a second receiving cavity 141. The first receiving cavity 131 and the second receiving cavity 141 are each provided with a stress loader 15. As some embodiments of the present application, as shown in the drawings, the first receiving cavity 131 has a first side wall 132, and the second receiving cavity 141 has a second side wall 142. The stress loader 15 in the first receiving cavity 131 is arranged on the first side wall 132, and the stress loader 15 in the second receiving cavity 141 is arranged on the second side wall 142. Figure 2 In the first direction (i.e., the X direction as shown),

[0032] In the first direction (i.e., the X direction as shown), Figure 3 As some embodiments of the present application, as shown in the drawings, the second mounting body 12 has a second left side wall 123 and a second right side wall 124 that are opposite and spaced apart. The two loading rams 16 are respectively arranged in the corresponding second left side wall 123 and second right side wall 124. Figure 3 Figure 3 In the first direction (i.e., the X direction as shown),

[0033] In the second direction (i.e., the Z direction as shown), Figure 2 In the second direction (i.e., the Z direction as shown), Figure 3 In the second direction (i.e., the Z direction as shown), Figure 2 As some embodiments of the present application, the second bottom wall 122 is integrally formed with the loading ram 16 to form a stepped base.

[0034] In the third direction (i.e., the Y direction as shown), Figure 2 ​As shown in the Y direction), both ends of the second mounting body 12 are provided with loading heads 16. As some embodiments of this application, such as Figure 2 As shown, along the third direction (i.e. Figure 2 (As shown in the Y direction), the second mounting body 12 has opposing front sidewalls 125 and rear sidewalls 126, and two loading heads 16 are respectively inserted into the corresponding front sidewalls 125 and rear sidewalls 126.

[0035] Multiple loading heads 16 are located at one end of the test chamber 127, collectively defining a sample space 128 suitable for placing the fractured rock mass 99. As some embodiments of this application, such as... Figure 3 and Figure 3 As shown, six loading heads 16 are located within the test chamber 127, collectively confining the fractured rock mass 99 within the sample space 128, along the first direction (i.e., Figure 2 (as shown in the X direction), the two loading heads 16 are positioned opposite each other, along the second direction (i.e. Figure 2 (as shown in the Z direction), the two loading heads 16 are positioned opposite each other, along the third direction (i.e. Figure 2 (As shown in the Y direction), the two loading heads 16 are set opposite each other.

[0036] The stress loader 15 can directly apply stress to the corresponding loading head 16 in the direction toward the sample space 128, or the stress loader 15 can indirectly apply stress to the corresponding loading head 16 in the direction toward the sample space 128. As some embodiments of this application, the stress loader 15 can directly apply force to the corresponding loading head 16 to directly apply stress to the corresponding loading head 16 in the direction toward the sample space 128. As some embodiments of this application, a piston rod 52 is provided between the stress loader 15 and the loading head 16, and the stress loader 15 can apply stress in a third direction (i.e., Figure 2 The force is applied to the piston rod 52 in the Y direction (as shown), indirectly applying stress to the corresponding loading head 16 in the direction toward the sample space 128. As some embodiments of this application, the second bottom wall 122 is integrally formed with the loading head 16 to construct a stepped base, allowing the stress loader 15 to apply stress along the second direction (i.e., the Y direction). Figure 3 The force (in the Z direction shown) is applied to the stepped base to indirectly apply stress to the corresponding loading head 16 in the direction toward the sample space 128.

[0037] First direction (i.e.) Figure 2 The X direction shown), the second direction (i.e. Figure 2 The Z direction shown), and the third direction (i.e. Figure 3 Any two directions in the Y-direction shown are perpendicular to each other, that is, the first direction (i.e., Figure 2 The X direction shown) and the second direction (i.e. Figure 3The Z-direction shown is perpendicular to each other, and the first direction (i.e. Figure 2 The X direction shown) and the third direction (i.e. Figure 2 The Y-direction shown is perpendicular to each other, and the third direction (i.e. Figure 2 The Y direction shown) and the second direction (i.e. Figure 6 The Z-direction shown is perpendicular to each other.

[0038] The water pressure loading system 2 can provide a water-rich environment with a certain pressure or flow rate to the fractured rock mass 99. The constant speed and constant pressure pump 22 is connected between the water storage tank 21 and the water inlet pipe 23. That is, the water storage tank 21, the constant speed and constant pressure pump 22, and the water inlet pipe 23 are connected in sequence, and the water inlet pipe 23 is connected to the fractured rock mass 99, so that the water in the water storage tank 21 is introduced into the fractured rock mass 99 at a certain speed or pressure.

[0039] As some embodiments of this application, such as Figure 7 As shown, the water pressure loading system 2 also includes a throttle valve 24, a liquid pressure regulating valve 25, and a first electromagnetic flowmeter 26. The throttle valve 24 is located between the water storage tank 21 and the constant speed and constant pressure pump 22. The liquid pressure regulating valve 25 and the first electromagnetic flowmeter 26 are both located in the water inlet pipe 23. The constant speed and constant pressure pump 22 and the liquid pressure regulating valve 25 work together to adjust the injection pressure or injection flow rate of the water entering the fractured rock mass 99. The first electromagnetic flowmeter 26 is used to monitor the injection flow rate of the water entering the fractured rock mass 99.

[0040] The pulse grouting system 3 can perform pulse grouting on the fractured rock mass 99. The pulse grouting pump 32 is connected between the grout storage tank 31 and the grout delivery pipe 33. That is, the grout storage tank 31, the pulse grouting pump 32, and the grout delivery pipe 33 are connected in sequence, and the grout delivery pipe 33 is connected to the fractured rock mass 99 so as to inject the grout in the grout storage tank 31 into the fractured rock mass 99.

[0041] As some embodiments of this application, such as Figure 3 As shown, the pulse grouting system 3 also includes a pressure transmitter 34 and a second electromagnetic flow meter 35. Both the pressure transmitter 34 and the second electromagnetic flow meter 35 are located in the grout delivery pipe 33. The pressure transmitter 34 and the second electromagnetic flow meter 35 can monitor the pulse pressure and flow rate of the grout during the grouting process.

[0042] The number of displacement extensometers 41 is multiple, including but not limited to two or three. In some embodiments of this application, the number of displacement extensometers 41 is three. The multiple displacement extensometers 41 are disposed on multiple loading heads 16. In some embodiments of this application, three displacement extensometers 41 are fixed on six loading heads 16 respectively.

[0043] The plurality of displacement extensometers 41 includes a first direction displacement extensometer 411, a second direction displacement extensometer 412, and a third direction displacement extensometer 413. The first direction displacement extensometer 411 is configured to measure displacement along a first direction (i.e., the X direction) shown in Figure 2 The second direction displacement extensometer 412 is configured to measure displacement along a second direction (i.e., the Z direction) shown in Figure 2 The third direction displacement extensometer 413 is configured to measure displacement along a third direction (i.e., the Y direction) shown in Figure 3

[0044] The data acquisition control device 415 is in signal connection with the plurality of displacement extensometers 41, and real-time displacement signals are acquired during the test. In some embodiments of the present application, the data acquisition control device 415 is in signal connection with the plurality of displacement extensometers 41 through a wire connection mode.

[0045] It should be noted that, by providing the true triaxial grouting test platform 1 with the stress loader 15 and the loading pressure head 16 along the first direction (i.e., the X direction) shown in Figure 2 the second direction (i.e., the Z direction) shown in Figure 2 the third direction (i.e., the Y direction) shown in Figure 2 , the complex stress environment of the underground engineering fractured rock mass 99 can be accurately reproduced, and the asymmetric dynamic regulation of the three-direction stress and the coupling effect of the grouting pressure and the fracture deformation during the synchronous grouting process can be achieved. , ,

[0046] Furthermore, by performing pulse grouting on the fractured rock mass 99 through the pulse grouting system 3, a pulse grouting pressure with a certain frequency can be formed to stimulate the dynamic directional expansion of the rock mass fracture, significantly increase the grouting diffusion range, and improve the grouting efficiency of the underground engineering fractured rock mass.

[0047] Moreover, the displacement extensometer 41 in the fractured rock mass true triaxial pulse grouting test control system 100 considering the grout-rock coupling effect can capture the normal opening amount, tangential slip amount, and spatial torsional deformation of the fractured rock mass 99 during the grouting process, and the coupling effect of the grouting pressure and the fracture deformation can be synchronized, which is conducive to the study of the adaptability of the engineering geological conditions and the grouting parameters.

[0048] Therefore, by coupling the true triaxial grouting test platform 1 and the pulse grouting system 3, the stress-seepage coupling environment of the fractured rock mass 99 during the grouting process can be simulated, and the pulse grouting system 3 provides pulse pressure grouting with a certain frequency to the fractured rock mass 99, which significantly improves the grouting efficiency of the fractured rock mass 99.

[0049] In some embodiments of the present application, as Figure 3 and​​Figure 2 As shown, the first mounting body 101 comprises a first mounting plate 1015, a second mounting plate 1016, a plurality of columns 1021, a third mounting plate 1017, and a fourth mounting plate 1018. The first mounting plate 1015 and the second mounting plate 1016 are arranged in the second direction. The plurality of columns 1021 are arranged through the first mounting plate 1015 and the second mounting plate 1016 to connect the first mounting plate 1015 and the second mounting plate 1016. The third mounting plate 1017 and the fourth mounting plate 1018 are arranged in the first direction and are arranged on the columns 1021. The stress loader 15 is arranged on the first mounting plate 1015, the second mounting plate 1016, the third mounting plate 1017, and the fourth mounting plate 1018.

[0050] The number of the columns 1021 can be two, three, four, or the like. In some embodiments of the present application, the number of the columns 1021 is four. Figure 2 As shown in the Z direction, the first mounting plate 1015 and the second mounting plate 1016 are arranged in the second direction. The plurality of columns 1021 are arranged through the first mounting plate 1015 and the second mounting plate 1016 to connect the first mounting plate 1015 and the second mounting plate 1016. In some embodiments of the present application, the first mounting plate 1015 and the second mounting plate 1016 are formed with a plurality of pairs of first matching holes 1023 arranged correspondingly. One column 1021 can be arranged through a corresponding pair of first matching holes 1023 to connect the first mounting plate 1015 and the second mounting plate 1016.

[0051] The columns 1021 can be connected to the first mounting plate 1015 and the second mounting plate 1016 by welding, bolt connection, or the like. In some embodiments of the present application, the plurality of columns 1021 are arranged through the first mounting plate 1015 and the second mounting plate 1016 and are bolted to the first mounting plate 1015 and the second mounting plate 1016. Figure 3 As shown in the Z direction, the first mounting plate 1015 is arranged above the second mounting plate 1016.

[0052] As shown in the X direction, the third mounting plate 1017 and the fourth mounting plate 1018 are arranged in the first direction and are arranged on the columns 1021. In some embodiments of the present application, the third mounting plate 1017 and the fourth mounting plate 1018 are connected to the columns 1021 by bolt connection. Figure 2 As shown in the X direction, the third mounting plate 1017 and the fourth mounting plate 1018 are arranged in the first direction and are arranged on the columns 1021. In some embodiments of the present application, the third mounting plate 1017 and the fourth mounting plate 1018 are connected to the columns 1021 by bolt connection.

[0053] As some embodiments of the present application, the first mounting body 101 further comprises a plurality of cover plates 1020 and a fifth mounting plate 1019, the fifth mounting plate 1019 is arranged on the first mounting plate 1015. Among the plurality of cover plates 1020, one cover plate 1020 is arranged on the fifth mounting plate 1019, one cover plate 1020 is arranged on the third mounting plate 1017, and one cover plate 1020 is arranged on the fourth mounting plate 1018. Such arrangement can provide a reaction force support point for the stress loader 15, so as to facilitate the stress loader 15 to load stress towards the test cavity 127. Moreover, the structural strength of the first mounting plate 1015, the third mounting plate 1017 and the fourth mounting plate 1018 can be improved, which is conducive to improving the supporting effect of the first mounting plate 1015, the third mounting plate 1017 and the fourth mounting plate 1018.

[0054] Such arrangement can make the first mounting body 101 simple in structure and reliable in use, improve the structural strength of the first mounting body 101, and provide a reaction force support point for the stress loader 15, so as to facilitate the stress loader 15 to load stress towards the test cavity 127, which is conducive to improving the use reliability of the crack rock mass true triaxial pulse grouting test control system 100 considering the grouting-rock coupling effect.

[0055] In some embodiments of the present application, as shown in Figure 4 and Figure 3 The true triaxial grouting test platform 1 further comprises a plurality of rollers 53, the lower ends of the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 are each provided with a roller 53, and the first mounting body 101 further comprises a guide rail 56, the second mounting plate 1016 is formed with a guide rail groove 55, the guide rail 56 is arranged in the guide rail groove 55, and the roller 53 is in rolling cooperation with the guide rail 56.

[0056] The number of rollers 53 can be, but is not limited to, two, three, etc. As some embodiments of the present application, the number of rollers 53 is eight, and the lower ends of the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 are each provided with a roller 53. The connection mode of the roller 53 and the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 can be direct connection or indirect connection. As some embodiments of the present application, a roller bracket 54 is arranged between the roller 53 and the second mounting body 12, the third mounting body 13 and the fourth mounting body 14, and the roller 53 is indirectly arranged on the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 through the roller bracket 54.

[0057] The number of guide rails 56 can be, but is not limited to, two, three, etc. As some embodiments of the present application, the number of guide rails 56 is two, and the two guide rails 56 are arranged in a first direction (i.e. the X direction shown in Figure 4 ).

[0058] As some embodiments of the present application, as shown inFigure 2 As shown, the first mounting plate 1015 is provided with a mounting groove 1022, and the fifth mounting plate 1019 is arranged in the mounting groove 1022. As some embodiments of the present application, the first mounting plate 1015 is provided with a mounting groove 1022, and the fifth mounting plate 1019 is arranged in the mounting groove 1022. Figure 2 As shown, the true triaxial grouting test platform 1 further comprises a guide rail leg 59 and a baffle 60, which are arranged along the third direction (i.e. the Y direction shown in the figure) of the true triaxial grouting test platform 1. Figure 4 As shown, the guide rail leg 59 is connected with the guide rail 56 and can support the guide rail 56, and the baffle 60 is arranged at both ends of the guide rail 56 to limit the roller 53.

[0059] As shown, the second mounting plate 1016 is formed with a guide rail groove 55, which is arranged along the third direction (i.e. the Y direction shown in the figure) and extends in the third direction. Figure 2 As shown, the guide rail groove 55 is arranged along the third direction (i.e. the Y direction shown in the figure) and extends in the third direction. Figure 2 As shown, the guide rail groove 55 is arranged along the third direction (i.e. the Y direction shown in the figure) and extends in the third direction. As some embodiments of the present application, the number of the guide rail grooves 55 is two, and the number of the guide rails 56 is the same as that of the guide rail grooves 55 and is arranged one by one.

[0060] The roller 53 can roll with the guide rail 56 to enable the roller 53 to roll along the third direction (i.e. the Y direction shown in the figure), and further enable the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 to move along the third direction (i.e. the Y direction shown in the figure). Figure 2 As shown, the roller 53 can roll with the guide rail 56 to enable the roller 53 to roll along the third direction (i.e. the Y direction shown in the figure), and further enable the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 to move along the third direction (i.e. the Y direction shown in the figure). Figure 2 As shown, the roller 53 can roll with the guide rail 56 to enable the roller 53 to roll along the third direction (i.e. the Y direction shown in the figure), and further enable the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 to move along the third direction (i.e. the Y direction shown in the figure).

[0061] As some embodiments of the present application, the guide rail 56 is arranged in the guide rail groove 55 by means of bolt connection. As some embodiments of the present application, the second mounting plate 1016 is formed with a receiving groove 1024, and the stress loader 15 can be arranged in the receiving groove 1024. The stress loader 15 can act force on the stepped base along the second direction (i.e. the Z direction shown in the figure) to indirectly apply stress to the corresponding loading pressure head 16 in the direction towards the sample space 128. Such arrangement can facilitate the movement of the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 along the third direction (i.e. the Y direction shown in the figure), and facilitate the assembly of the second mounting body 12, the third mounting body 13 and the fourth mounting body 14, which is conducive to reducing the operation difficulty of the true triaxial grouting test platform 1 and improving the use stability of the crack rock mass true triaxial pulse grouting test control system 100 considering the grout-rock coupling effect. Figure 2 As shown, the roller 53 can roll with the guide rail 56 to enable the roller 53 to roll along the third direction (i.e. the Y direction shown in the figure), and further enable the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 to move along the third direction (i.e. the Y direction shown in the figure). Figure 5 As shown, the roller 53 can roll with the guide rail 56 to enable the roller 53 to roll along the third direction (i.e. the Y direction shown in the figure), and further enable the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 to move along the third direction (i.e. the Y direction shown in the figure).

[0062] As some embodiments of the present application, the guide rail 56 is arranged in the guide rail groove 55 by means of bolt connection. As some embodiments of the present application, the second mounting plate 1016 is formed with a receiving groove 1024, and the stress loader 15 can be arranged in the receiving groove 1024. The stress loader 15 can act force on the stepped base along the second direction (i.e. the Z direction shown in the figure) to indirectly apply stress to the corresponding loading pressure head 16 in the direction towards the sample space 128. Such arrangement can facilitate the movement of the second mounting body 12, the third mounting body 13 and the fourth mounting body 14 along the third direction (i.e. the Y direction shown in the figure), and facilitate the assembly of the second mounting body 12, the third mounting body 13 and the fourth mounting body 14, which is conducive to reducing the operation difficulty of the true triaxial grouting test platform 1 and improving the use stability of the crack rock mass true triaxial pulse grouting test control system 100 considering the grout-rock coupling effect. Figure 2As shown, the true triaxial grouting test platform 1 further comprises: a plurality of loading pressure plates 17, each of the plurality of loading pressure heads 16 is provided with a loading pressure plate 17, and each of the loading pressure plates 17 is located in the test cavity 127. Among them, the number of loading pressure plates 17 is more than one, which can be two, three, four, etc., and as some embodiments of the present application, the number of loading pressure plates 17 is six.

[0063] Each of the plurality of loading pressure heads 16 is provided with a loading pressure plate 17, and each of the loading pressure plates 17 is located in the test cavity 127. The connection mode of the loading pressure head 16 and the loading pressure plate 17 can be welding, bolt connection, etc., and as some embodiments of the present application, the loading pressure head 16 and the loading pressure plate 17 are connected by bolt connection. As some embodiments of the present application, the loading pressure head 16 and the loading pressure plate 17 are configured as an integral molded part.

[0064] As some embodiments of the present application, as shown in Figure 2 As shown, along the third direction (i.e. the Y direction shown in Figure 5 The second mounting body 12 has opposite front and rear side walls 125 and 126 along the third direction (i.e. the Y direction shown in

[0065] In some embodiments of the present application, as shown in Figure 2 As shown, the true triaxial grouting test platform 1 further comprises: a rubber sleeve 57 and a fixing ring 58, the rubber sleeve 57 can be sleeved on the fractured rock mass 99 and the loading pressure plates 17 of the loading pressure heads 16 on both ends of the second mounting body 12 along the third direction (i.e. the Y direction shown in Figure 2 As shown, the rubber sleeve 57 can be sleeved on the fractured rock mass 99 and the loading pressure plates 17 of the loading pressure heads 16 on both ends of the second mounting body 12 along the third direction (i.e. the Y direction shown in

[0066] Among them, the rubber sleeve 57 is sleeved on the fractured rock mass 99 and the loading pressure plates 17 of the loading pressure heads 16 on both ends of the second mounting body 12 along the third direction (i.e. the Y direction shown in Figure 2 That is, the rubber sleeve 57 can be sleeved on the fractured rock mass 99, and the rubber sleeve 57 can be sleeved on the loading pressure plates 17 of the loading pressure heads 16 on both ends of the second mounting body 12 along the third direction (i.e. the Y direction shown in Figure 2 The fixing ring 58 is sleeved outside the rubber sleeve 57, and the fixing ring 58 can tighten the rubber sleeve 57 along the radial direction to fix the rubber sleeve 57.

[0067] As some embodiments of the present application, the number of fixed rings 58 is two, and the two fixed rings 58 are arranged at both ends of the rubber sleeve 57 along the third direction (i.e., the Y direction shown in the figure) to fix the rubber sleeve 57. As some embodiments of the present application, the sealing rings are arranged on the loading pressure heads 16 at both ends of the second mounting body 12 along the third direction (i.e., the Y direction shown in the figure), and the rubber sleeve 57 is arranged outside the loading pressure plates 17 on the loading pressure heads 16 at both ends of the second mounting body 12 along the third direction (i.e., the Y direction shown in the figure) and can cover the sealing rings arranged on the loading pressure heads 16 at both ends. Figure 2 Figure 2 As some embodiments of the present application, the sealing rings are arranged on the loading pressure heads 16 at both ends of the second mounting body 12 along the third direction (i.e., the Y direction shown in the figure), and the rubber sleeve 57 is arranged outside the loading pressure plates 17 on the loading pressure heads 16 at both ends of the second mounting body 12 along the third direction (i.e., the Y direction shown in the figure) and can cover the sealing rings arranged on the loading pressure heads 16 at both ends. Figure 2

[0068] As some embodiments of the present application, the sealing rings are arranged on the loading pressure heads 16 at both ends of the second mounting body 12 along the second direction (i.e., the Z direction shown in the figure), and the sealing rings are arranged on the loading pressure heads 16 at both ends of the second mounting body 12 along the first direction (i.e., the Z direction shown in the figure). Figure 2 Figure 5 As some embodiments of the present application, the sealing rings are arranged on the loading pressure heads 16 at both ends of the second mounting body 12 along the second direction (i.e., the Z direction shown in the figure), and the sealing rings are arranged on the loading pressure heads 16 at both ends of the second mounting body 12 along the first direction (i.e., the Z direction shown in the figure). In this way, the sealing performance of the second mounting body 12 can be improved.

[0069] The rubber sleeve 57 has the characteristics of large flexibility, tensile strength, and shrinkage after heating, and thus the risk of leakage of slurry from the test cavity 127 and the fractured rock mass 99 can be reduced, and the use stability of the fractured rock mass true triaxial pulse grouting test control system 100 considering the coupling effect of slurry-rock can be improved.

[0070] In some embodiments of the present application, as shown in Figure 2 and Figure 1 The pulse grouting system 3 further includes a grouting pipe 36, the slurry conveying pipe 33 extends into the first containing cavity 131 and is connected with the grouting pipe 36, the grouting pipe 36 penetrates the loading pressure head 16 and the corresponding loading pressure plate 17 of the stress loader 15 of the first containing cavity 131 and extends into the fractured rock mass 99. The third mounting body 13 defines the first containing cavity 131, part of the slurry conveying pipe 33 can extend into the first containing cavity 131, the slurry conveying pipe 33 can be connected with the grouting pipe 36, and the grouting pipe 36 can penetrate the loading pressure head 16 and the loading pressure plate 17 of the stress loader 15 in the first containing cavity 131 and extend into the fractured rock mass 99, so that the slurry conveying pipe 33 can communicate with the fractured rock mass 99, and the slurry in the slurry storage tank 31 can be injected into the fractured rock mass 99.

[0071] As some embodiments of the present application, the sealing rings are arranged on the loading pressure heads 16 at both ends of the second mounting body 12 along the third direction (i.e., the Y direction shown in the figure), and the rubber sleeve 57 is arranged outside the loading pressure plates 17 on the loading pressure heads 16 at both ends of the second mounting body 12 along the third direction (i.e., the Y direction shown in the figure) and can cover the sealing rings arranged on the loading pressure heads 16 at both ends. Figure 1 ​​​As shown in the Y direction), the second mounting body 12 has opposite front and rear side walls 125 and 126, and the grouting pipe 36 can be arranged in the first accommodating cavity 131 to communicate with the fractured rock mass 99 through the grouting hole of the stress loader 15 corresponding to the loading pressure head 16 and the loading pressure plate 17.

[0072] In this way, grouting test research can be facilitated, and the true triaxial stress state of the underground rock mass can be accurately reproduced.

[0073] In some embodiments of the present application, as shown in the Y direction), the pulse grouting system 3 further comprises a water outlet pipe 37 and a water gushing collection tank 38, the water outlet pipe 37 is connected between the first accommodating cavity 131 and the water gushing collection tank 38, that is, the first accommodating cavity 131, the water outlet pipe 37 and the water gushing collection tank 38 are sequentially connected and arranged, which can smoothly discharge and recover the water or slurry gushing from the first accommodating cavity 131, reduce the risk of excessive water gushing from the first accommodating cavity 131, and improve the test accuracy. Figure 1

[0074] In some embodiments of the present application, as shown in the Y direction), the pulse grouting system 3 further comprises a water outlet pipe 37 and a water gushing collection tank 38, the water outlet pipe 37 is connected between the first accommodating cavity 131 and the water gushing collection tank 38, that is, the first accommodating cavity 131, the water outlet pipe 37 and the water gushing collection tank 38 are sequentially connected and arranged, which can smoothly discharge and recover the water or slurry gushing from the first accommodating cavity 131, reduce the risk of excessive water gushing from the first accommodating cavity 131, and improve the test accuracy. Figure 2

[0075] In some embodiments of the present application, as shown in the Y direction), the pulse grouting system 3 further comprises a water outlet pipe 37 and a water gushing collection tank 38, the water outlet pipe 37 is connected between the first accommodating cavity 131 and the water gushing collection tank 38, that is, the first accommodating cavity 131, the water outlet pipe 37 and the water gushing collection tank 38 are sequentially connected and arranged, which can smoothly discharge and recover the water or slurry gushing from the first accommodating cavity 131, reduce the risk of excessive water gushing from the first accommodating cavity 131, and improve the test accuracy. Figure 1 Figure 2 In some embodiments of the present application, as shown in the Y direction), the pulse grouting system 3 further comprises a water outlet pipe 37 and a water gushing collection tank 38, the water outlet pipe 37 is connected between the first accommodating cavity 131 and the water gushing collection tank 38, that is, the first accommodating cavity 131, the water outlet pipe 37 and the water gushing collection tank 38 are sequentially connected and arranged, which can smoothly discharge and recover the water or slurry gushing from the first accommodating cavity 131, reduce the risk of excessive water gushing from the first accommodating cavity 131, and improve the test accuracy.

[0076] The camera 40 is arranged in the first accommodating cavity 131, and the camera 40 can be arranged in the first accommodating cavity 131 in the form of clamping or bolt connection, and as some embodiments of the present application, the camera 40 is arranged in the first accommodating cavity 131 by bolt connection. As some embodiments of the present application, the camera 40 is fixed to the first accommodating cavity 131 by a bracket.

[0077] ​​​The camera 40 is signal connected with the data acquisition control device 415. As some embodiments of the present application, the camera 40 is signal connected with the data acquisition control device 415 in a mode of electrical connection through a wire. The camera 40 can monitor the gushing water in the grouting process. Specifically, the camera 40 can directly collect the gushing water condition information of the fractured rock mass 99 in the grouting process, and can feed back the information to the data acquisition control device 415. In this way, the grouting process can be monitored in real time to observe the grout flow and the grouting water plugging effect, and visual data can be provided to better control the grouting end time, thereby improving the reliability and accuracy of the experimental data.

[0078] In some embodiments of the present application, as shown in Figure 6 、 Figure 1 and Figure 8 , the water inlet pipe 23 is arranged in the loading pressure head 16 corresponding to the stress loader 15 arranged in the second receiving cavity 141 and is in communication with the fractured rock mass 99; or, the loading pressure head 16 corresponding to the stress loader 15 arranged in the second receiving cavity 141 forms a water inlet channel, the water inlet pipe 23 is in communication with the water inlet channel, and the water inlet channel is in communication with the fractured rock mass 99.

[0079] That is, the stress loader 15 is arranged in the second receiving cavity 141, the stress loader 15 of the second receiving cavity 141 is correspondingly provided with the loading pressure head 16, the water inlet channel is arranged in the loading pressure head 16, and the water inlet channel is in communication with the fractured rock mass 99. As some embodiments of the present application, the water inlet pipe 23 is arranged in the rear side wall 126 of the second mounting body 12 and is connected with the loading pressure head 16 corresponding to the stress loader 15 of the second receiving cavity 141, and is in communication with the fractured rock mass 99 through the water inlet channel, so that the water in the water storage tank 21 enters the fractured rock mass 99 in a certain pressure or speed.

[0080] As some embodiments of the present application, the stress loader 15 is arranged in the second receiving cavity 141, the stress loader 15 of the second receiving cavity 141 is correspondingly provided with the loading pressure head 16, the loading pressure head 16 is correspondingly provided with the loading pressure plate 17, and the water inlet channel is arranged in the loading pressure head 16 and the loading pressure plate 17. The water inlet channel is in communication with the fractured rock mass 99. The water inlet pipe 23 is arranged in the rear side wall 126 of the second mounting body 12 and is connected with the loading pressure head 16 corresponding to the stress loader 15 of the second receiving cavity 141, and is in communication with the fractured rock mass 99 through the water inlet channel, so that the water in the water storage tank 21 enters the fractured rock mass 99 in a certain pressure or speed.

[0081] In this way, the gushing water environment of the fractured rock mass in the actual engineering can be better simulated.

[0082] In some embodiments of the present application, as shown in Figure 2 and Figure 2As shown, the data measurement and control system 4 comprises: a hydraulic pump station 414, a data acquisition control device 415 in communication connection with the hydraulic pump station 414, the hydraulic pump station 414 is connected with the plurality of stress loaders 15, and the data acquisition control device 415 is configured to control the hydraulic pump station 414 to control the loading stress of the plurality of stress loaders 15.

[0083] The data acquisition control device 415 is in communication connection with the hydraulic pump station 414. The hydraulic pump station 414 is connected with the plurality of stress loaders 15. As some embodiments of the present application, the hydraulic pump station 414 is connected with the plurality of stress loaders 15 through pipelines. The data acquisition control device 415 can control the hydraulic pump station 414 to control the loading stress of the plurality of stress loaders 15 by controlling the amount of hydraulic oil output by the hydraulic pump station 414 to the plurality of stress loaders 15.

[0084] The arrangement can enable the data acquisition control device 415 to accurately, stably and servo-control the loading stress of the stress loader 15 through the hydraulic pump station 414, which is conducive to accurately simulating the actual stress environment of the fractured rock mass 99 and improving the reliability of the test data.

[0085] In some embodiments of the present application, as shown, Figure 2 The loading pressure head 16 corresponding to the stress loader 15 arranged in the second accommodating cavity 141 comprises: a pressure head body 51 and a piston rod 52, the pressure head body 51 is located in the test cavity 127, and the piston rod 52 is arranged in the second mounting body 12 and connected with the pressure head body 51.

[0086] The second accommodating cavity 141 is provided with the stress loader 15, and the stress loader 15 in the second accommodating cavity 141 is provided with the loading pressure head 16. The loading pressure head 16 comprises the pressure head body 51 and the piston rod 52. The pressure head body 51 is located in the test cavity 127. The piston rod 52 can be arranged in the rear side wall 126 of the second mounting body 12 and connected with the pressure head body 51. The pressure head body 51 and the piston rod 52 can be connected in the form of, but not limited to, bolt connection, clamping and the like. As some embodiments of the present application, the pressure head body 51 and the piston rod 52 are connected in the form of clamping.

[0087] As some embodiments of the present application, the second mounting body 12 has a rear side wall 126, and the piston rod 52 can be arranged in the rear side wall 126 of the second mounting body 12 and connected with the pressure head body 51.

[0088] The arrangement facilitates assembly, improves assembly efficiency, facilitates the stress loader 15 to apply stress to the loading pressure head 16, and reduces the risk of interference between the loading pressure head 16 and the second mounting body 12 during loading stress.

[0089] According to the test method of the crack rock mass true triaxial pulse grouting test control system considering the crack-rock coupling effect according to the present application, the following steps can be performed: S1, crack rock mass preparation. According to the crack parameters of the rock mass on site, a crack rock mass with different structural surfaces and geometric parameters (such as inclination, dip angle, trace length, etc.) is designed and prepared, and the self-weight stress and tectonic stress levels of the crack rock mass at the depth during the actual grouting process are determined according to the actual stress measurement data on site. As some embodiments of the present application, the size of the crack rock mass can be 200mm*200mm*200mm.

[0090] S2, assembly of crack rock mass assembly. The two loading pressure heads, the two loading pressure plates, and the crack rock mass are coaxially positioned and assembled along the third direction (i.e. the Y direction shown in the figure), and the rubber sleeve is externally sleeved and tightened, and the rubber sleeve is sealed. The assembled crack rock mass assembly is placed in the sample space in the test cavity. Figure 3

[0091] S3, test cavity assembly. Displacement extensometers are respectively installed on the sides of the plurality of loading pressure heads, the water inlet pipe is sequentially passed through the second receiving cavity, the rear side wall of the second mounting body, the loading pressure head of the second receiving cavity, and communicated with the crack rock mass, the piston rod is passed through the rear side wall of the second mounting body and connected with the loading pressure head in the test cavity along the third direction (i.e. the Y direction shown in the figure), and the grouting pipe is sequentially passed through the loading pressure head of the front first receiving cavity and the corresponding loading pressure plate and communicated with the crack rock mass, and then the grouting pipe is connected with the grouting pipe in the first receiving cavity. Figure 2

[0092] S4, assembly of third mounting body and fourth mounting body. The third mounting body is moved to the second mounting body by the roller, the third mounting body and the front side wall of the second mounting body are connected by bolt connection, and the third mounting body and the second mounting body are sealed, then the fourth mounting body is moved to the second mounting body by the roller, the rear side wall of the fourth mounting body and the second mounting body are connected by bolt connection, and the fourth mounting body and the second mounting body are sealed, and the water outlet pipe is communicated with the first receiving cavity of the third mounting body.

[0093] S5, true triaxial stress loading. First, the stress loader under the second bottom wall of the second mounting body is loaded by the data control system, so that the second mounting body, the third mounting body and the fourth mounting body rise as a whole, and then the stress loading is stopped after the roller leaves the guide rail, and then the stress loading is performed in the first direction (i.e. the X direction shown in the figure) and the second direction (i.e. the Z direction shown in the figure), and then the stress loading is performed in the third direction (i.e. the Y direction shown in the figure) after the stress reaches the initial value and is stable. Figure 2 Figure 2 Figure 3

[0094] ​​​​​S6, pulse grouting test is carried out. After the three-way stress reaches the initial value and is stable, the water injection pressure parameter is set through the water pressure loading system, the constant-speed constant-pressure pump and the liquid pressure regulating valve are opened to inject water, the image information collection is carried out through the data measurement and control system to control the camera, when the loading pressure head of the first containing cavity appears sudden water inrush, the pulse grouting parameter is set through the pulse grouting system, the pulse grouting pump is opened to start pulse grouting, and the grouting is stopped when the obvious water inrush phenomenon no longer appears or the grouting parameter reaches the grouting requirement.

[0095] S7, the grouting test is ended. The stress in the third direction (i.e. the Y direction shown in the figure) is unloaded first, then the stress in the first direction (i.e. the X direction shown in the figure) and the second direction (i.e. the Z direction shown in the figure) is unloaded, then the second mounting body, the third mounting body 13 and the fourth mounting body are disassembled, and the test cavity, the first containing cavity, the second containing cavity, the grouting pipe and the grout conveying pipe are cleaned. Figure 2 ​ ​

[0096] As some embodiments of the present application, the reinforced fractured rock mass 99 can be continuously subjected to the mechanical parameter test through the above steps to improve the accuracy of the test data.

[0097] In the description of the present application, the meaning of "a plurality of" is two or more.

[0098] In the description of the present application, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0099] In the description of the present application, the first feature "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0100] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0101] ​​​While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the application. The scope of the application is not to be limited by the embodiments shown and described, but only by the claims and their equivalents.

Claims

1. A true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling, characterized in that, include: A true triaxial grouting test platform, comprising: a first mounting body, a second mounting body, a third mounting body, a fourth mounting body, multiple stress loaders, and multiple loading heads, wherein the multiple stress loaders correspond one-to-one with the multiple loading heads; Along the first direction, the stress loaders are provided at both ends of the first mounting body. Along the second direction, the stress loaders are provided at both ends of the first mounting body. The second mounting body is disposed in the first mounting body and defines a test cavity. The third mounting body and the fourth mounting body are disposed at both ends of the second mounting body along the third direction. The third mounting body defines a first receiving cavity, and the fourth mounting body defines a second receiving cavity. The stress loaders are provided in both the first receiving cavity and the second receiving cavity. Along the first direction, the loading head is passed through both ends of the second mounting body. Along the second direction, the loading head is passed through the upper end of the second mounting body, and the loading head is fixed to the inner side of the lower end of the second mounting body. Along the third direction, the loading head is passed through both ends of the second mounting body. Multiple loading heads are located at one end of the test chamber and jointly define a sample space suitable for placing fractured rock mass. The stress loader is used to directly or indirectly apply stress to the corresponding loading head along the direction toward the sample space. Any two of the first direction, the second direction, and the third direction are perpendicular to each other. A water pressure loading system, comprising: a water storage tank, a constant speed and constant pressure pump, and an inlet pipe, wherein the constant speed and constant pressure pump is connected between the water storage tank and the inlet pipe, and the inlet pipe is adapted to communicate with the fractured rock mass; A pulse grouting system, comprising: a grout storage tank, a pulse grouting pump, and a grout delivery pipe, wherein the pulse grouting pump is connected between the grout storage tank and the grout delivery pipe, and the grout delivery pipe is adapted to communicate with the fractured rock mass; A data measurement and control system includes: multiple displacement extensometers and a data acquisition and control device. The multiple displacement extensometers are disposed on multiple loading heads. The multiple displacement extensometers include: a first-direction displacement extensometer, a second-direction displacement extensometer, and a third-direction displacement extensometer. The data acquisition and control device is signal-connected to the multiple displacement extensometers and is configured to control the loading stress of the multiple stress loaders.

2. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 1, characterized in that, The first mounting body includes: a first mounting plate, a second mounting plate, a plurality of columns, a third mounting plate, and a fourth mounting plate. The first mounting plate and the second mounting plate are spaced apart along the second direction. The plurality of columns pass through the first mounting plate and the second mounting plate to connect the first mounting plate and the second mounting plate. The third mounting plate and the fourth mounting plate are spaced apart along the first direction and are all provided on the columns. The first mounting plate, the second mounting plate, the third mounting plate, and the fourth mounting plate are all provided with the stress loader.

3. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 2, characterized in that, The true triaxial grouting test platform further includes: multiple rollers, the lower ends of the second mounting body, the third mounting body, and the fourth mounting body are all provided with the rollers, the first mounting body further includes: a guide rail, the second mounting plate forms a guide rail groove, the guide rail is disposed in the guide rail groove, and the rollers roll in cooperation with the guide rail.

4. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 1, characterized in that, The true triaxial grouting test platform also includes: multiple loading plates, and each of the multiple loading heads is provided with a loading plate at one end of the test chamber.

5. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 4, characterized in that, The true triaxial grouting test platform further includes: a rubber sleeve and a fixing ring. The rubber sleeve can be fitted onto the outside of the fractured rock mass and the loading pressure plate on the loading pressure head that passes through both ends of the second mounting body along the third direction. The fixing ring is fitted onto the outside of the rubber sleeve to fix the rubber sleeve.

6. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 4, characterized in that, The pulse grouting system further includes: a grouting pipe, the grout delivery pipe extending into the first receiving cavity and connected to the grouting pipe, the grouting pipe passing through the loading head and the corresponding loading plate of the stress loader in the first receiving cavity and extending into the fractured rock mass.

7. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 1, characterized in that, The pulse grouting system further includes: a water outlet pipe and a water inflow collection tank, wherein the water outlet pipe is connected between the first receiving cavity and the water inflow collection tank; And / or, the pulse grouting system further includes: a reflux valve, the reflux valve being disposed on the grout delivery pipe.

8. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 1, characterized in that, The pulse grouting system further includes a camera device, which is located in the first receiving cavity and is signal-connected to the data acquisition and control equipment. The camera device is used to collect data on water inrush during the grouting process.

9. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 1, characterized in that, The water inlet pipe passes through the loading head corresponding to the stress loader located in the second receiving cavity and is adapted to communicate with the fractured rock mass; Alternatively, the loading head corresponding to the stress loader located in the second receiving cavity forms a water inlet channel, the water inlet pipe is connected to the water inlet channel, and the water inlet channel is adapted to communicate with the fractured rock mass.

10. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 1, characterized in that, The data measurement and control system includes a hydraulic pump station, and the data acquisition and control device is communicatively connected to the hydraulic pump station. The hydraulic pump station is connected to multiple stress loaders, and the data acquisition and control device is configured to control the hydraulic pump station to control the applied stress of the multiple stress loaders.

11. The true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling as described in claim 1, characterized in that, The loading head corresponding to the stress loader located in the second receiving cavity includes a head body and a piston rod. The head body is located in the test cavity, and the piston rod passes through the second mounting body and is connected to the head body.

12. A test method for a true triaxial pulse grouting test control system for fractured rock mass considering magma-rock coupling, characterized in that, include: Preparation of the fractured rock mass; Assemble the fractured rock mass assembly, including: coaxially positioning and assembling two loading heads, two loading plates, and the fractured rock mass along a third direction, then covering the outside with a rubber sleeve and tightening it, sealing the rubber sleeve, and placing the assembled fractured rock mass assembly in the test chamber; Assemble the test chamber, including: installing displacement extensometers on the sides of the multiple loading heads respectively, connecting the water inlet pipe to the fractured rock mass, inserting the piston rod through the rear side wall of the second mounting body and connecting it to the loading head in the test chamber, connecting the grouting pipe to the fractured rock mass, and connecting the grout delivery pipe to the grouting pipe; Assembling the third and fourth mounting bodies includes: connecting the third mounting body to the front sidewall of the second mounting body, connecting the fourth mounting body to the rear sidewall of the second mounting body, and connecting the water outlet pipe to the first receiving cavity of the third mounting body; True triaxial stress loading includes: loading the stress loader under the second bottom wall of the second mounting body through the data measurement and control system, causing the second mounting body, the third mounting body, and the fourth mounting body to rise as a whole; stopping the loading after the roller leaves the guide rail; then loading the first and second directions through the data measurement and control system; and loading the third direction stress after the stress reaches the initial value and stabilizes. The pulse grouting test includes: after the triaxial stresses have reached their initial values ​​and stabilized, the water injection pressure parameters are set through the water pressure loading system, the constant speed and constant pressure pump and the liquid pressure regulating valve are turned on to inject water, and the image information is collected by the camera device controlled by the data measurement and control system. When a sudden surge of water occurs at the loading head of the first receiving cavity, the pulse grouting parameters are set through the pulse grouting system, the pulse grouting pump is turned on to start pulse grouting, and grouting is stopped when no obvious sudden water surge occurs or the grouting parameters meet the grouting requirements.

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